Grinding-wheel dresser



J. DOBSON.

GRINDING WHEEL DRESSER.

APPLICATION FILED Nov. 22, |919.

1,382,176. Patented June 21, 1921.

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UNITED STATES JOSEPH DOBSON, OF SHEFFIELD, ENGLAND.

GRINDINGr-WHEEL DRESSER.

Specication of Letters Patent.

Patented June 21, 1921.

Application led November 22, 1919. Serial No. 340,014.

f! 10 @ZZ @1f/wm t may concern t Be it known that I, JOSEPH DoesoN, a subject of the King of England, residing at Sheiiield, in the county of York, England, have invented certain new and useful Improvements in Grinding-llVheel Dressers, of which the following is a specification.

This invention relates to dressers for grinding wheels and it has for its object to provide more useful and durable construction than exists at present. Usually the bearings formed, in the holder for the spindle wear oval quickly, so that the life of the holder is short, and it has frequently to be renewed.

According to this invention, the bearings are formed in a pair of carriers detachable from the holder, and each carrier is provided with a plurality of bearings or holes constituting the bearings, so that the life of cach carrier is considerable. For example, there may be six holes arranged in a circle on a disk, which constitutes a4 carrier, each holo being used in turn as a bearing.

In the accomjjianying drawings, Y

Figure l. is a side elevation, partly in section, of a dresser constructed in accordance with this invention.

Fig. 2 is a plan of the same partly in section, and

Fig, $3 is a perspective front View of part of the holder` Like letters indicate like parts throughout the drawings.

ln this construction, the holder A is formed with the usual jaws B and the 0pposed faces of the jaws lare slotted or recessed at B2 to receive the carriers C, which therefore lie against the alws. Each carrier is preferably jiolygonal, haring as many sides as there are lilearing holes D, and the flat sides C2 engage the sides of the slots or recesses D2 in the jaws. The carriers are secured to the jaws by screws E screwing into holes in the center of the carriers and it will be clear that the carriers can be fitted in the holder n as many angular positions as there are sides.

To assemble the dresserj the spindle F car-I Y rying the grinding disks G is mounted in twol holes D in the two carriers and the carriers then inserted into the slots B2 and secured by the screws E in such a position that the spindle F lies as far from the holder as is possible, as is shown. When these two bearing holes wear oval, the carriers can be withdrawn, the spindle inserted in a fresh pair of holes D and the carier's replaced after having been turned through a small angle to bring the spindle to the front again. The carriers are then again fixed by the central screws E.

it will be noticed that the spindle F is offset from the screws E, and therefore the disks Gf project considerably from the holder and their life is very much longer than usual as they can wear down much farther Athan usual before any other parts become damaged by the grinding wheel. the carriers C can be renewed without the necessity for renewing the holder, and the life of each carrier is also considerable in view of the large number of holes which may be employed.

lWhat I claim as my invention and desire to secure by Letters Patent is l. 1n a grinding wheel dresser, `the combination of a holder, jaws 'to said holder,

slots in said jaws, a pair of polygonal carriers detachably mounted Ain said slots, a plurality of bearing1 holes in said carriers, and avspindle mounted in two of said bearing holes.

2. ln a grinding wheel dresser, the combination of a holder, jaws toV said holder, slots in said jaws, a polygonal carrier in each of said jaws, screws on said jawsengaging the centers of said carriers, bearing holes in said carriers Ycorresponding in number to the number of sides thereof, and a Vspindle mounted in two of said bearing holes. Y

ln testimony whereof I have signed myY name to this specification in the presence lof two subscribing witnesses.

JOSEPH DOBSON. Witnesses:

JAS. LIs'rER, ,BERNARD D. DANIEL.

Further, that 

